Steam-generator



D. R 7 Steam nerator.

No. 237,408. Patented Feb. 8,1881.

ITNOGRAFNEH WASH UNITED STATES PATENT OFFICE.

DAVID RENSHAW, OF OOHASSELASSIGNOR OF ONE-HALF TO DREW & OOFFIN, OFBOSTON, MASSACHUSETTS.

STEAM-GENERATO R.

SPECIFICATION forming part of Letters Patent No. 237,408, dated February8, 1881.

- Application filed February 20, 1880.

improvement on the boiler patented to me August 3, 1880, and numbered230,818. For this purpose I construct each section'of my generator witha small lower pipe, A, and large upper pipe, B, parallel to one anotherand horizontal, the said pipes being connected by curved tapering pipesC, so that the pipes A, B, and G form one unbroken continuous pipe. Fromthe lower pipe, A, within the space inclosed by the pipes A, B, and 0,vertical pipes D rise a short distance and connect with semicircularpipes, D, said pipes D having each two openings into the pipe B, andboth D and D having the same diameter.

In the drawings, Figure 1 shows a partial section through the generator,showing one section in front elevation; and Fig. 2 shows a section inside elevation.

The water in the pipe A, when heated, rises rapidly through the pipes Dand strikes against thelower portion of the semicircular pipe D, bywhich action it is broken up effectually for the disengagement of steam,expanded and passed to the upper pipe, B, through two branches, D D,each of the diameter of pipe D, entering said pipe B through twoopenings, each of the size of the outlet from the pipe A. Thisconstruction, in addition to the breaking up of the water passingthrough D by its contact with the bottom of D, slows the current anddelivers the water to pipe B with much less velocity and with lessderangement of the water-surface in B than would be attained if the pipeD had only one connection with pipe B. The water thus thrown into pipe Bwill, after its steam is disengaged, return by means of the pipes G tothe lower pipe, A, to be again v forced through the pipes D and D,broken up and expanded as before, said arrangement and construction ofthe pipes affording a complete circulation of the water, and itsconsequent evaporation.

I have shown in the drawings but two series of the pipes D D, and thiswould be all that would be requisite fora small boiler; but it isevident (and one of the features of my invention) that the pipes A and Bmay be prolonged, and three, four, or many more such series be connectedwith them, so that the sections may be placed endwise to the front ofthe boiler and extended any desired distance beyond the fire, several ofthem being arranged side by side, and this, in connection with the shortdistance between the bottom of the pipe A and the top of the pipe B,would make the boiler available for many purposes. The sections areconnected together by feed-pipes E and steam-drum G in an ordinarymanner.

What I claim as my invention, and desire to secure by Letters Patent,is-

The section of a boiler composed of a small lower horizontal pipe, A,and large upper horizontal pipe, B, connected at their ends by curvedtapering pipes C, said pipes. A and B being further connected by shortvertical pipes D engaging with semicircular pipes D, all as described,and for the purpose specified.

DAVID BEN SHAW.

Witnesses:

GHAs. F. SLEEPER, WM. ZI'ITEL.

